Scheduling problem with mysql: 5.10.1 how row behind 5.2-CodePudding

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Scheduling problem with mysql: 5.10.1 how row behind 5.2

Time：09-24

How to sort, hierarchical list form such as
1.1
1.2
1.2.1
2
2.1
2.2
2.2.1
2.3
2.10
How should write to get 2.10 row behind 2.2.1